Mobile compressed foam firefighting system

Abstract

A mobile compressed foam firefighting unit comprising a mixing chamber connected at the outlet to the foam feeder, and the following systems connected to the mixing chamber inlet: a water supply system comprising a water pump and a water pump drive, a foam concentrate supply system comprising a foam pump and a foam pump drive, and an air supply system comprising an air compressor and an air pump drive. The system includes a drive motor, and drives of the air compressor and the foam pump comprise variable hydraulic transmissions kinetically connected to the drive motor, and the system is equipped with a water flow meter, a throttle valve with an electric drive and a check valve, and an electronic control unit of the throttle valve installed in the water supply pipe between the water pump and the mixing chamber.

The invention claimed is: 
     
       1. A mobile compressed foam firefighting unit comprising:
 a mixing chamber, an outlet of the mixing chamber connected to a foam feeder for providing foam to the seat of a fire;
 a water supply system comprising a water pump and a water pump drive connected by pipes to an inlet of the mixing chamber, 
 a foam concentrate supply system comprising a foam pump and a foam pump drive connected by pipes to an inlet of the mixing chamber, and 
 an air supply system comprising an air compressor and an air compressor drive connected by pipes to an inlet of the mixing chamber; 
 
 wherein the firefighting unit comprises: 
 a drive motor; 
 a water flow meter, a throttle valve with an electric drive, a check valve, and an electronic control unit of the throttle valve installed in a water supply pipe between the water pump and the mixing chamber; 
 input of the electronic control unit of the throttle valve is electrically connected with output of the water flow meter, and the output of the electronic control unit of the throttle valve is electrically connected with the input of the electric drive of the throttle valve; 
 the air compressor drive comprises a variable hydraulic transmission, and the foam pump drive comprises a variable hydraulic transmission; and 
 the variable hydraulic transmission of the air compressor drive and the variable hydraulic transmission of the foam pump drive are kinetically connected to the drive motor. 
 
     
     
       2. The mobile compressed foam firefighting unit according to  claim 1 , wherein an internal combustion engine or electric motor is installed as a drive motor, and the air compressor drive and foam pump drive are independent of a fire pump drive. 
     
     
       3. The mobile compressed foam firefighting unit according to  claim 1 , wherein the variable hydraulic transmission of the air compressor drive comprises an adjustable hydraulic pump and a non-adjustable hydraulic motor for the air compressor drive connected by piping, and the variable hydraulic transmission for the foam pump drive comprises an adjustable hydraulic pump and a non-adjustable hydraulic motor for the foam pump drive connected by piping. 
     
     
       4. The mobile compressed foam firefighting unit according to  claim 1 , wherein the water supply system comprises a water valve, the water flow meter, a water drain valve, the throttle valve with the electric drive and the check valve installed in series in the water supply pipe between the water pump and the mixing chamber, and the water supply system comprises the electronic control unit of the throttle valve, with the output of the water flow meter electrically connected to the input of the electronic control unit of the throttle valve, and the output of the electronic control unit of the throttle valve connected by an electric conductor to the input of the electric drive of the;
 wherein the foam concentrate supply system comprises a foam concentrate container and a foam concentrate supply valve, the foam pump, a foam concentrate drain valve, a foam concentrate flow meter, and a foam concentrate check valve installed in series in a pipeline between the foam concentrate container and the mixing chamber, and the foam concentrate supply system comprises an electronic control unit of the foam concentrate supply system, wherein inputs of the electronic control unit of the foam concentrate supply system are connected by electrical conductors to outputs of a rotation sensor of the foam pump and the foam concentrate flow meter and an output of the electronic control unit of the foam concentrate supply system is connected by an electrical conductor to an input of an adjustable hydraulic pump of the hydraulic transmission of the foam pump drive; 
 wherein the air supply system comprises a three-way valve and a check air valve installed in series in a pipeline between the air compressor and the mixing chamber, and the air supply system comprises an electronic control unit of the air supply system, wherein an output of the electronic control unit of the air supply system is electrically connected to an input of a controlled hydraulic pump of the variable hydraulic transmission of the air compressor drive, and an input of the electronic control unit of the air supply system is electrically connected to the output of a rotation sensor of the air compressor; and 
 an electrical input of the electronic control unit of the foam concentrate supply system and an electrical input of the electronic control unit of the air-supply system are electrically connected to an electrical output of the water flow meter or to an electrical output of the electronic control unit of the throttle valve. 
 
     
     
       5. The mobile compressed foam firefighting unit according to  claim 1 , wherein the air supply system is connected to the water supply system by a pipeline comprising a check drain valve and a drain valve installed in series, and the water supply system is connected to the foam concentrate supply system by a pipeline comprising a flushing valve. 
     
     
       6. A chassis of a ground vehicle comprising the mobile compressed foam firefighting unit according to  claim 1 . 
     
     
       7. A mobile railway platform comprising the mobile compressed foam firefighting unit according to  claim 1 .